EP2112749B1 - Compresseur motorisé - Google Patents

Compresseur motorisé Download PDF

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Publication number
EP2112749B1
EP2112749B1 EP09158563.8A EP09158563A EP2112749B1 EP 2112749 B1 EP2112749 B1 EP 2112749B1 EP 09158563 A EP09158563 A EP 09158563A EP 2112749 B1 EP2112749 B1 EP 2112749B1
Authority
EP
European Patent Office
Prior art keywords
motor
insulating tube
bundle
wire
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09158563.8A
Other languages
German (de)
English (en)
Other versions
EP2112749A3 (fr
EP2112749A2 (fr
Inventor
Hiroshi Fukasaku
Ken Suitou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
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Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP2112749A2 publication Critical patent/EP2112749A2/fr
Publication of EP2112749A3 publication Critical patent/EP2112749A3/fr
Application granted granted Critical
Publication of EP2112749B1 publication Critical patent/EP2112749B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/0085—Prime movers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/803—Electric connectors or cables; Fittings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine

Definitions

  • the present invention relates to a motor-driven compressor having a metal housing, an electric motor housed in the metal housing and a compression unit also housed in the metal housing and compresses refrigerant by being driven by the electric motor, wherein a neutral point of the electric motor is formed by a connecting portion that connects core wires of polyphase coils of the electric motor, and to a method of manufacturing a motor-driven compressor.
  • Metal housing of a motor-driven compressor generally houses therein not only an electric motor but also a compression unit compresses refrigerant by being driven by the electric motor.
  • the refrigerant circulates through the compressor in gaseous form during its normal operation.
  • the compressor is stopped and the gaseous refrigerant in the housing is cooled, however, the refrigerant may be liquefied and collected in the housing in the form of a liquid.
  • the liquid refrigerant has a lower specific resistivity than the gaseous refrigerant. Though varying depending on the kind of oil, some oils used to lubricate the motor-driven compressor may reduce its specific resistivity by being mixed with the liquid refrigerant.
  • any conductive portion of the electric motor that is exposed to the interior of the housing is put in the liquid refrigerant collected in the housing, therefore, the conductive portion and the housing are electrically connected through the liquid refrigerant.
  • insulation resistance between the conductive portion and the housing is reduced by a decrease of the specific resistivity of the liquid refrigerant. If the motor-driven compressor with a decreased insulation resistance is started, there is a fear that electric current supplied to the conductive portion may leak to the housing through the liquid refrigerant and oil.
  • Document JP 2001-182655 A proposes a motor-driven compressor according to which the insulation resistance between the conductive portion and the housing through the liquid refrigerant is increased.
  • the motor-driven compressor includes a feeder terminal as the above conductive portion that is held by the base of a metal housing through an insulating member.
  • the feeder terminal and the insulating member that are located inside the metal housing are covered with an insulating resin tube.
  • the insulating resin tube covers the feeder terminal with one end of the insulating resin tube set in close contact with the insulating member. If liquid refrigerant is collected in the metal housing, leakage current between the feeder terminal and the base flows through the liquid refrigerant having the lowest specific resistivity therebetween. Thus, the insulation resistance between the feeder terminal and the base depends on the creepage distance along the insulating resin tube and the insulating member and on the area of the passage of the liquid refrigerant through which the leakage current flows. Because the insulating resin tube is set in close contact with the insulating member, the creepage distance is higher as compared to the case where no such insulating resin tube is provided, so that the insulation resistance is increased.
  • the electric motor of a motor-driven compressor includes three-phase coils having a U-phase coil, a V-phase coil and a W-phase coil.
  • the ends of the three-phase coils are drawn out therefrom and connected together to form a connecting portion as the conductive portion, which provides a neutral point of the electric motor.
  • Document JP 2005-278289 A discloses a neutral terminal device of a rotating electric machine which is designed to prevent a short circuit between the conductive wires of the coils of the rotating electric machine and the ends of the neutral lines of the coils.
  • the neutral terminal is formed so that the ends of the neutral lines do not project out from a metal sleeve and the neutral terminal is covered with an insulation cap.
  • the neutral point is generally formed in such a way that the length of the conductive wire that is drawn out from the coil and the length of the connecting portion are as small as possible.
  • the neutral point is formed as short as possible.
  • the neutral terminal is covered as the neutral point with the insulation cap as in the case of document JP 2005-278289 A only provides poor insulation resistance between the neutral terminal and the housing when the liquid refrigerant enters into the insulation cap and the neutral terminal is put in the liquid refrigerant.
  • Document EP 0 341 407 A2 discloses a scroll-type hermetic compressor including a compressor mechanism having a fixed scroll member.
  • the fixed scroll member includes a plate portion that is subject to forces causing deflection thereof.
  • a housing cover plate is attached to the back surface of the fixed scroll member so as to define a discharge pressure chamber therebetween for exposing a partial area of the back surface to compressed refrigerant fluid.
  • the discharge pressure chamber also serves as a discharge muffler.
  • a compressor mechanism is mounted to a top cover plate before the top cover plate is attached to an open-ended shell to form a hermetically sealed housing. The compressor mechanism is suspended from the top cover plate and extends into the interior of the housing.
  • connection insulator for a dynamoelectric machine having a magnetic core and at least one winding arranged thereon comprising a plurality of coils of wire conductors with end turns thereof projecting beyond side faces of the core and being subject to pressure forces during compacting and forming and with lead wires extending therefrom.
  • the insulator is formed of a flexible heat-shrinkable electrical insulating material and comprises a tubular portion with an open end adapted to receive an electrical connection joining at least one of the lead wires with another wire and a closed end with an integral flat tab portion extending axially therefrom at a junction with the tubular portion.
  • a substantial part of the tab portion spaced from the junction is adapted to be grippingly engaged by the end turns of one of the coils and a substantial part of the tubular portion spaced from the junction is adapted to be grippingly engaged by the end turns of an adjoining coil.
  • the electrical connection is located within the tubular portion and adjacent the closed end thereof. The parts of the tubular and tab portions not engaged by the end turns of adjoining coils span a space between adjoining coils and are substantially unaffected by pressure forces applied during compacting and forming of the end turns.
  • Document JP 2001-218407 A discloses a stator of a motor constituted by laminating a plurality of stator iron sheets, and provided with a stator core in which a plurality of teeth and slots are formed on the inner periphery, a pair of insulators which are engaged with the stator core from both end portions in the axial direction and insulate the stator core, and a stator winding wound around the teeth insulated by the insulators.
  • Each of the insulators has a plurality of comb engaging parts which enter the slots of the stator core.
  • a connector is connected to one end of wires of the stator winding, and another end of the wires forms a neutral wire.
  • WO 2007/007922 A1 discloses a neutral point terminal which is formed by electrically connecting with each other a plurality of phases of coil windings included by an alternating-current rotary electric machine having the plurality of phases, and which is inserted into an insulating cover prefabricated into a bag shape to be fitted thereinto, and thereby insulated from the surroundings.
  • the present invention which has been made in light of the above problems, is directed to a motor-driven compressor and a method of manufacturing such a motor-driven compressor, wherein insulation resistance between a connecting portion and a housing of the compressor when liquid refrigerant is collected in the housing is increased.
  • a motor-driven compressor 10 having a housing 11 made of a die-cast metal such as aluminum alloy.
  • a rotary shaft 12 is rotatably supported in the housing 11 and an electric motor M is housed in the housing 11 for driving to rotate the rotary shaft 12.
  • a compression unit C which is operable to compress refrigerant gas in accordance with the rotation of the rotary shaft 12 is housed in the housing 11.
  • the compression unit C is of a scroll type, including a fixed scroll 13A and a movable scroll 13B.
  • An inlet port 11A is formed in the housing 11 for allowing refrigerant gas to be drawn into the housing 11.
  • the compression unit C is operable to compress gaseous refrigerant (or refrigerant gas) by rotating the movable scroll 13A relative to the fixed scroll 13A in accordance with the rotation of the rotary shaft 12.
  • refrigerant gas under a low temperature and a low pressure in the external refrigeration system (not shown) is drawn from the inlet port 11A into the compression unit C while passing close to the electric motor M.
  • the refrigerant gas drawn into the compression unit C is increased in temperature and pressure by being compressed by the compression unit C and then discharged to the external refrigeration system through an outlet port 11 B formed in the housing 11.
  • the refrigerant passes through the motor-driven compressor 10 in the form of a gas during its normal operation, the refrigerant (or liquid refrigerant) may be liquefied when the operation of the motor-driven compressor 10 is stopped and the refrigerant gas remaining in the housing 11 is cooled, so that the refrigerant is collected in the housing 11 in the form of a liquid.
  • An inverter cover 15 is joined to the housing 11 and a motor drive circuit 16 for driving the electric motor M is housed inside the inverter cover 15.
  • a hermetically sealed terminal 18 is fixed to the housing 11 at a position inside the inverter cover 15.
  • the hermetically sealed terminal 18 is electrically connected to the motor drive circuit 16 through lead wire (not shown).
  • An input terminal 19 is connected to the hermetically sealed terminal 18 for allowing signal of the motor drive circuit 16 to be transmitted to the electric motor M.
  • the electric motor M is driven by receiving electric power from the motor drive circuit 16.
  • Lubricating oil such as polyalkylene glycol
  • refrigerant gas serving to lubricate various sliding surfaces in the motor-driven compressor 10. This lubricating oil has a characteristic that reduces its specific resistivity by being mixed with liquid refrigerant.
  • the electric motor M includes a rotor 40 and a cylindrical stator 20.
  • the rotor 40 has a rotor core 41 and a plurality of flat permanent magnets 42 that are embedded in the rotor core 41.
  • the rotor core 41 is made of a plurality of core sheets 41A laminated together and each made of a magnetic material such as steel sheet.
  • the rotor core 41 is fixedly mounted on the rotary shaft 12.
  • the stator 20 has a cylindrical stator core 21 and three-phase coils 29.
  • the stator core 21 has in the inner periphery thereof a plurality of teeth 22 and a plurality of slots 23U, 23V, 23W each formed between any two adjacent teeth 22.
  • the three-phase coils 29 have a U-phase coil 30U, a V-phase coil 30V and a W-phase coil 30W that are formed by winding conductive wires in the slots 23U, 23V, 23W in the manner of wave winding, respectively.
  • Each of the coils 30U, 30V and 30W includes a core wire 30A made of copper and an insulator 30B made of enamel and covering the core wire 30A (refer to Fig. 4 ).
  • the U-phase coil 30U having one end thereof connected to a terminal 16U of the motor drive circuit 16 through the input terminal 19 is inserted in a group of first slots 23U.
  • the V-phase coil 30V having one end thereof connected to a terminal 16V of the motor drive circuit 16 through the input terminal 19 is inserted in a group of second slots 23V.
  • the W-phase coil 30 W having one end thereof connected to a terminal 16W of the motor drive circuit 16 through the input terminal 19 is inserted in a group of third slots 23W.
  • each coil 30U, 30V, 30W indicates the portion of the coil 30U, 30V, 30W that is wired on one end face of the stator 20 (or coil end 29A, refer to Fig. 3 ).
  • the broken line of each coil 30U, 30V, 30W indicates the portion of the coil 30U, 30V, 30W that is wired on the other end face of the stator 20 (or coil end 29B, refer to Fig. 3 ).
  • the connection between the solid line and the broken line of each coil 30U, 30V, 30W indicates the portion of the coil 30U, 30V, 30W that is inserted in the slot 23U, 23V, 23W.
  • the ends of the coils 30U, 30V and 30W which are connected to the terminals 16U, 16V and 16W are drawn out from the coil end 29A to form an extension 33 as shown in Fig. 3 .
  • the extension 33 is fixed at a position adjacent to the three-phase coils 29 to the coil end 29A by a lacing cord 34A and connected at the end thereof that is far from the three-phase coils 29 to the input terminal 19.
  • the other ends of the coils 30U, 30V and 30W are drawn out from the coil end 29A and bound together to form a wire bundle 35 as shown in Fig. 5 .
  • the wire bundle 35 has a drawing portion 32 that draws out the conductive wires from the three-phase coils 29 and located adjacent thereto.
  • the wire bundle 35 is positioned relative to the coils 29 when the drawing portion 32 is fixed to the coil end 29A by a lacing cord 34B (refer to Fig. 3 ).
  • the wire bundle 35 has at the distal end thereof away from the drawing portion 32 a connecting portion 36 where the core wires 30A of the coils 30U, 30V and 30W are connected together.
  • the connecting portion 36 provides a neutral point of the electric motor M.
  • the wire bundle 35 also has an elongated portion 37 so that a predetermined length of the wire bundle 35 is ensured between the drawing portion 32 and the connecting portion 36.
  • the wire bundle 35 is made longer than the wire bundle that consists only of the drawing portion 32 and the connecting portion 36 by the length corresponding to the elongated portion 37.
  • Each core wire 30A at the elongated portion 37 is entirely covered by its insulator 30B.
  • the elongated portion 37 is provided for making the creepage distance between the connecting portion 36 and the housing 11 longer thereby to increase the insulation resistance therebetween.
  • the wire bundle 35 is covered by a heat-shrinkable insulating tube 38. More specifically, the connecting portion 36 and the elongated portion 37 of the wire bundle 35 are covered with the insulating tube 38 and the drawing portion 32 is exposed out of the insulating tube 38. Thus, the drawing portion 32 extends out from the opened end of the insulating tube 38 to the coil end 29A.
  • the wire bundle 35 and the insulating tube 38 cooperate to form a covered bundle portion 39.
  • the covered bundle portion 39 has an elongated shape and is bent in an arcuate shape so as to follow the coil end 29A.
  • the insulating tube 38 is of an elongated tubular shape having one end thereof opened and the other end thereof closed. The insulating tube 38 is so made that liquid refrigerant is allowed to enter into the insulating tube 38 only from the opened end thereof.
  • the wire bundle 35 is covered with the insulating tube 38 with the distal end of the connecting portion 36 in contact with the inner end of the insulating tube 38.
  • the insulating tube 38 is radially shrunk by heating at such a position that the insulating tube 38 is in close contact with the elongated portion 37 of the wire bundle 35.
  • the covered bundle portion 39 is formed to allow liquid refrigerant to enter into the insulating tube 38 through the opened end thereof.
  • the inner peripheral surface of the insulating tube 38 and the insulator 30B of the coils 30U, 30V, 30W facing the inner peripheral surface of the insulating tube 38 are insulated from each other so as not to be electrically conducted through liquid refrigerant.
  • the length of the covered bundle portion 39 between the opened end of the insulating tube 38 and the distal end of the elongated portion 37 adjacent to the connecting portion 36 is preferably set to a quarter of the circumference of the cylindrical core 21 or more with the covered bundle portion 39 installed on the coil end 29A as shown in Fig. 3 .
  • the above length setting of the covered bundle portion 39 to make longer the creepage distance between the connecting portion 36 and the housing 11 is made to ensure the necessary insulation resistance.
  • the length of the covered bundle portion 39 between the opened end of the insulating tube 38 and the distal end of the elongated portion 37 adjacent to the connecting portion 36 is preferably set to the length of the circumference of the cylindrical core 21 or less. It is noted that the length of the elongated portion 37 and the insulating tube 38 is set depending on the material of the housing 11, the kind of the refrigerant and the oil, and so forth.
  • Figs. 6A and 6B provide schematic illustrations to describe understandably the function of the covered bundle portion 39.
  • the connecting portion 36 is distanced from the drawing portion 32 for the length of the elongated portion 37, as shown in Fig. 6A .
  • the connecting portion 36 and the elongated portion 37 are covered with the insulating tube 38 and the insulator 30B of the elongated portion 37 and the insulating tube 38 are isolated from each other. Therefore, the current leaked from the connecting portion 36 flows toward the opened end of the insulating tube 38 through liquid refrigerant in the direction indicated by the arrow A along the elongated portion 37. Then, the leakage current flows to the housing 11 through the liquid refrigerant outside the insulating tube 38.
  • the length of the arrow A represents the creepage distance between the connecting portion 36 and the housing 11.
  • the length of the insulating tube 38 would be decreased.
  • the creepage distance between the connecting portion 36 and the housing 11, or the length of the arrow B in the case of Fig. 6B would be decreased.
  • the insulation resistance due to liquid refrigerant is increased with an increase of the distance for which leakage current flows through liquid refrigerant (or the creepage distance). Therefore, providing the wire bundle 35 with the elongated portion 37, the creepage distance between the connecting portion 36 and the housing 11 is increased.
  • the motor-driven compressor of the above-described embodiment offers the following advantageous effects.
  • the covered bundle portion 39 may be placed along the extension 33 so that the covered bundle portion 39 is fixed at the distal end thereof away from the drawing portion 32 to the extension 33 by a lacing cord 34C.
  • the covered bundle portion 39 is not interfered with any parts in the housing 11.
  • the projection of the coil end 29A due to the presence of the covered bundle portion 39 is lessened. Therefore, the electric motor M is prevented from being increased in size while increasing the insulation resistance between the housing 11 and the connecting portion 36 by the covered bundle portion 39.
  • the connecting portion 36 of the covered bundle portion 39 tends to be located above the level of liquid refrigerant when the liquid refrigerant is collected in the housing 11, which helps to reduce the fear of electric current leaking through the liquid refrigerant. Because the connecting portion 36 does not need to be put in liquid refrigerant in inspecting the electric motor M for its insulation resistance through liquid refrigerant, the coils 29 may be inspected accurately for any pinholes.
  • an insulating tube 43 may be used instead of the insulating tube 38.
  • the insulating tube 43 differs from the insulating tube 38 in that the opposite ends are opened and the tube itself is made longer than the insulating tube 38. That is, with the wire bundle 35 inserted in the insulating tube 43 from one opened end of the insulating tube 43, the insulating tube 43 has an elongated portion 43A in which the wire bundle 35 is covered so as to increase the creepage distance between the connecting portion 36 and the housing 11 thereby to increase the insulation resistance. Therefore, the insulating tube 43 is longer than the insulating tube 38 by the length of the elongated portion 43A.
  • liquid refrigerant enters into the insulating tube 43 from both opened ends thereof.
  • the electric current supplied to the connecting portion 36 leaks from both opened ends of the insulating tube 43 to the housing 11 through liquid refrigerant having a small specific resistivity.
  • the electric current leaks to the housing 11 through the lubricating oil that reduces its specific resistivity by being mixed with liquid refrigerant.
  • the provision of the elongated portion 37 in the wire bundle 35 increases the creepage distance between the connecting portion 36 and the housing 11, so that the insulation resistance between the connecting portion 36 and the housing 11 is increased when leakage current flows from the opened end of the insulating tube 43 adjacent to the drawing portion 32 to the housing 11.
  • leakage current flows from the opened end of the insulating tube 43 adjacent to the elongated portion 43A to the housing 11, on the other hand, leakage current from the connecting portion 36 flows along the elongated portion 43A through the liquid refrigerant. Because the creepage distance between the connecting portion 36 and the housing 11 is increased, the insulation resistance between the connecting portion 36 and the housing 11 is increased, accordingly.
  • the insulating tube 43 which is opened at both ends is made more easily as compared to the insulating tube whose one end is closed by thermal welding. It is preferable to use heat-shrinkable material in making the insulating tube 43 and also to thermally shrink the elongated portion 43A of the insulating tube 43 thereby to reduce the area of the passage of the elongated portion 43A. In this structure, the passage of the elongated portion 43A through which leakage current flows through the liquid refrigerant is reduced, so that insulation resistance is increased as compared to the case wherein the elongated portion 43A is not thermally shrunk.
  • the covered bundle portion 39 may have a plurality of sections (two sections in the case of Fig. 9 ) by folding back the elongated portion 43A at a position corresponding to the distal end of the connecting portion 36.
  • the covered bundle portion 39 thus folded is advantageous in that it can be made compact.
  • the insulating tube 38 does not need to be thermally shrunk.
  • the U-phase coil 30U, the V-phase coil 30V and the W-phase coil 30W are formed by winding conductive wires in the slots 23U, 23V, 23W in the manner of wave winding, respectively.
  • the winding manner of the conductive wires in the slots 23U, 23V, 23W is not limited to the wave winding.
  • the surface area of the connecting portion 36 should be as small as possible for increasing the insulation resistance.
  • the wire bundle 35 is covered with the insulating tube 38 with the distal end of the connecting portion 36 in contact with the inner end of the insulating tube 38.
  • the distal end of the connecting portion 36 does not need to be in contact with the inner end of the insulating tube 38 if a sufficient insulation resistance is increased between the connecting portion 36 and the housing 11.
  • the electric motor M has three-phase coils 29.
  • the electric motor M may have any other polyphase coils other than the three-phase coils.
  • An electric motor includes a cylindrical stator that is formed with a plurality of slots.
  • the cylindrical stator has polyphase coils that are formed by winding a plurality of conductive wires in the slots to have polyphase, a wire bundle and an insulating tube covering the wire bundle.
  • Each conductive wire includes a core wire and an insulator that covers the core wire.
  • the wire bundle has a drawing portion, a connecting portion and an elongated portion that is elongated between the drawing portion and the connecting portion for increasing creepage distance between the connecting portion and the housing thereby to increase insulation resistance.
  • the connecting portion of the wire bundle provides a neutral point of the electric motor.
  • the elongated portion and the connecting portion of the wire bundle are covered with the insulating tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Compressor (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (11)

  1. Compresseur motorisé (10) comprenant:
    un boîtier métallique (11) ;
    une borne hermétiquement scellée (18) fixée au boîtier (11) et raccordée à un circuit d'entraînement de moteur (16) ;
    une unité de compression (C) pour compresser du réfrigérant logé dans le boîtier (11) ;
    un moteur électrique (M) configuré pour entraîner en rotation l'unité de compression (C) logée dans le boîtier (11) ; et
    une borne d'entrée (19) raccordée à la borne hermétiquement scellée (18) et configurée pour raccorder le circuit d'entraînement de moteur (16) au moteur électrique (M),
    dans lequel le moteur électrique (M) comprend un stator cylindrique (20) ayant un noyau de stator cylindrique (21) qui est formé avec une pluralité de fentes (23U, 23V, 23W) séparées par des dents (22), dans lequel le stator cylindrique (20) a :
    des enroulements polyphasés (29) qui sont formés par une pluralité de fils conducteurs (30U, 30V, 30W) enroulés dans les fentes (23U, 23V, 23W) pour être polyphasés, dans lequel chaque fil conducteur (30U, 30V, 30W) comprend un fil d'âme (30A) et un isolant (30B) qui recouvre le fil d'âme (30A),
    un faisceau de fils (35) formé par une extrémité de chaque fil conducteur (30U, 30V, 30W) qui est tirée des enroulements polyphasés (29) et reliée avec les autres, et
    une extension (33) formée par l'autre extrémité de chaque fil conducteur (30U, 30V, 30W) qui est tirée des enroulements polyphasés (29), l'extension (33) étant raccordée à la borne d'entrée (19),
    dans lequel le faisceau de fils (35) a une partie de traction (32) qui tire les fils conducteurs des enroulements polyphasés (29) et une partie de raccordement (36) où les fils d'âme (30A) des fils conducteurs sont raccordés aux extrémités des fils conducteurs ensemble, dans lequel la partie de raccordement (36) du faisceau de fils (35) fournit un point mort du moteur électrique (M), dans lequel :
    le stator cylindrique (20) a un tube isolant (38, 43) recouvrant le faisceau de fils (35), dans lequel le faisceau de fils (35) a également une partie allongée (37) qui est allongée entre la partie de traction (32) et la partie de raccordement (36), dans lequel la partie allongée (37) et la partie de raccordement (36) du faisceau de fils (35) sont recouvertes avec le tube isolant (38, 43) et forment une partie de faisceau recouverte (39), dans lequel le faisceau de fils (35) est formé selon une forme arquée suivant les extrémités des enroulements polyphasés (29) dans la même direction que l'extension (33) et ayant une longueur prédéterminée de sorte que la partie de faisceau recouverte (39) est placée le long de l'extension (33), dans lequel la partie de faisceau recouverte (39) est fixée à l'extension (33).
  2. Compresseur motorisé (10) selon la revendication 1, dans lequel le tube isolant (38) est de forme tubulaire allongée ayant son extrémité ouverte et son autre extrémité fermée.
  3. Compresseur motorisé (10) selon la revendication 1, dans lequel le tube isolant (43) est formé de sorte que ses extrémités opposées sont ouvertes, dans lequel, avec le faisceau de fils (35) inséré dans le tube isolant (43) à partir d'une extrémité ouverte du tube isolant (43), le tube isolant (43) a une partie allongée (43A) qui est positionnée entre la partie de raccordement (36) et l'autre extrémité ouverte du tube isolant (43).
  4. Compresseur motorisé (10) selon la revendication 3, dans lequel la partie allongée (43A) du tube isolant (43) comprend une pluralité de sections qui sont orientées de manière alternée dans des directions opposées entre elles en repliant la partie allongée (43A) au moins dans une position correspondant à une extrémité distale de la partie de raccordement (36).
  5. Compresseur motorisé (10) selon l'une quelconque des revendications 1 à 4, dans lequel une longueur de la partie de faisceau recouverte (39) entre une extrémité ouverte du tube isolant (38) et une extrémité distale de la partie allongée (37) adjacente à la partie de raccordement (36) est déterminée pour représenter un quart ou plus d'une circonférence du noyau de stator cylindrique (21) et une longueur de la circonférence du noyau de stator cylindrique (21) ou moins.
  6. Compresseur motorisé selon la revendication 5, dans lequel la partie de faisceau recouverte (39) est fixée sur l'extension (33) par une corde de laçage (34C).
  7. Compresseur motorisé (10) selon l'une quelconque des revendications 1 à 6, dans lequel le tube isolant (38, 43) est thermorétractable.
  8. Compresseur motorisé (10) selon l'une quelconque des revendications 1 à 7, dans lequel les fils conducteurs sont enroulés dans les fentes (23U, 23V, 23W) à la manière d'un enroulement ondulé.
  9. Compresseur motorisé selon l'une quelconque des revendications 1 à 8, dans lequel chaque fil d'âme (30A) au niveau de la partie allongée (37) du faisceau de fils (35) est entièrement recouvert par son isolant (30B).
  10. Compresseur motorisé selon l'une quelconque des revendications 1 à 9, dans lequel le réfrigérant dans le boîtier métallique (11) contient de l'huile lubrifiante de polyalkylène glycol.
  11. Procédé pour fabriquer un compresseur motorisé (10), le compresseur motorisé comprenant un boîtier métallique (11), une borne hermétiquement scellée (18) fixée au boîtier (11) et raccordée à un circuit d'entraînement de moteur (16), une unité de compression (C) pour compresser du réfrigérant logé dans le boîtier (11), un moteur électrique (M) configuré pour entraîner en rotation l'unité de compression (C) logée dans le boîtier (11) et une borne d'entrée (19) raccordée à la borne hermétiquement scellée (18) et configurée pour raccorder le circuit d'entraînement de moteur (16) au moteur électrique (M), dans lequel le procédé comprend les étapes consistant à :
    prévoir un stator cylindrique (20) ayant une âme de stator cylindrique (21) qui est formée avec une pluralité de fentes (23U, 23V, 23W) séparées par des dents (22),
    former des enroulements polyphasés (29) en enroulant une pluralité de fils conducteurs (30U, 30V, 30W) dans les fentes (23U, 23V, 23W) pour être polyphasés, dans lequel chaque fil conducteur (30U, 30V, 30W) comprend un fil d'âme (30A) et un isolant (30B) qui recouvre le fil d'âme (30A),
    former un faisceau de fils (35) par une extrémité de chaque fil conducteur (30U, 30V, 30W) qui est tirée des enroulements polyphasés (29) et reliée aux autres, dans lequel le faisceau de fils (35) a une partie de traction (32) qui tire les fils conducteurs des enroulements polyphasés (29) et une partie de raccordement (36) où les fils d'âme (30A) des fils conducteurs sont raccordés aux extrémités des fils conducteurs ensemble, dans lequel la partie de raccordement (36) du faisceau de fils (35) fournit un point mort du moteur électrique (M),
    former une extension (33) par l'autre extrémité de chaque fil conducteur (30U, 30V, 30W) qui est tirée des enroulements polyphasés (29), l'extension (33) étant raccordée à la borne d'entrée (19),
    recouvrir le faisceau de fils (35) avec un tube isolant (38, 43), dans lequel le faisceau de fils (35) a également une partie allongée (37) qui est allongée entre la partie de traction (32) et la partie de raccordement (36), dans lequel la partie allongée (37) et la partie de raccordement (36) du faisceau de fils (35) sont recouvertes avec le tube isolant (38, 43) et forment une partie de faisceau (39) recouverte,
    former le faisceau de fils (35) avec une longueur prédéterminée en une forme arquée suivant les extrémités des enroulements polyphasés (29) dans la même direction que l'extension (33),
    placer la partie de faisceau recouverte (39) le long de l'extension (33) et
    fixer la partie de faisceau recouverte (39) sur l'extension (33).
EP09158563.8A 2008-04-25 2009-04-23 Compresseur motorisé Not-in-force EP2112749B1 (fr)

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JP2008115829A JP5115306B2 (ja) 2008-04-25 2008-04-25 電動圧縮機

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EP2112749A3 EP2112749A3 (fr) 2015-04-15
EP2112749B1 true EP2112749B1 (fr) 2016-11-16

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Also Published As

Publication number Publication date
JP2009264279A (ja) 2009-11-12
EP2112749A3 (fr) 2015-04-15
US8138643B2 (en) 2012-03-20
US20090269222A1 (en) 2009-10-29
CN101566144A (zh) 2009-10-28
CN101566144B (zh) 2011-08-31
EP2112749A2 (fr) 2009-10-28
JP5115306B2 (ja) 2013-01-09

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